High speed cruising?
They're stable,..they seem to like it, no heating,..or cooling issues. However, sustained HIGH SPEEDS(I don't consider 100mph to be in that catergory),...for extended periods of time could cause your diff/trans fluid to overheat,..hence the need for heatexhangers/ coolers on diffs/trans/oiling systems on mostly all track/race cars that see contiuous velocity.
And for the record, my STS cruises at 110 mph like it was born for the autobahn. Very stable. Very flat and effortlessly controlable. The vette likes 150 plus.



